package demo5;

class Counter {
    public int count = 0;
    public void add() {
        synchronized (this){
            count++;
        }
    }
}
class Lock{

}
public class ThreadDemo1 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();
        Thread t1 = new Thread(()->{
            for (int i = 0;i < 50000;i++) {
                counter.add();
            }
        });
        Thread t2 = new Thread(()-> {
            for (int i =0;i < 50000;i++) {
                counter.add();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.count);
    }

}
